Contract Staff Software Engineer-Bug Burndown

Mozilla · posted Oct 20, 2026

Open to candidates in United Kingdom

Staff

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What this job asks for

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Must have

•Web development (HTML, CSS, JavaScript)
•Debug real-world site breakage
•Browser devtools
•Cross-browser diagnosis
•Use AI tooling for diagnosis/fixes

Nice to have

•Gecko knowledge
•WebCompat experience
•Web-standards experience

Tools and technologies

HTML, CSS, JavaScript

Read the full posting

You will help reduce Firefox’s WebCompat bug backlog by finishing or verifying the diagnosis of the long tail of site-breakage bugs, and by writing interventions or simple fixes (often with AI assistance). You turn a large queue of reported breakages into diagnosed, actionable, or fixed bugs.

Responsibilities

Finish diagnosing, or verify the diagnosis of, long-tail WebCompat bugs.
Write WebCompat interventions where appropriate.
Write simple fixes (AI-assisted) and land them.
Reproduce and triage incoming site-breakage reports.

Required qualifications

Solid web development (HTML, CSS, JavaScript) and comfort debugging real-world site breakage.
Fluent with browser devtools and cross-browser diagnosis.
Comfortable using AI tooling to speed up diagnosis and fixes.

Preferred